More Nitrogen Upstream, Fewer Filters Downstream
http://www.lacoast.gov/watermarks/2004-09/2nitrogen/

Louisiana Coastal Wetlands Conservation and Restoration Task Force- WaterMarks


This USGS-sponsored site provides an explanation for the low oxygen conditions of the "dead zone" stemming from the Mississippi River and Gulf of Mexico watersheds. The factors that contribute to this eutrophication involve the landscape, agricultural and industrial practices, and changes in the Mississippi itself. The site features a color map of the drainage basins.

This resource is referenced here:
Subject: Biology:Ecology:Principles, Geoscience:Hydrology:Surface Water:Water Quality/Chemistry , Biology:Microbiology, Ecology:Habitats:Water Column, Marine
Resource Type: Scientific Resources:Overview/Reference Work
Grade Level: General Public, College Lower (13-14), Middle (6-8), High School (9-12)
Theme: Teach the Earth:Course Topics:Hydrology/Hydrogeology, Ecology, Teach the Earth:Teaching Topics:Water
Extreme Environments: Anoxic, Altered by Humans
Ocean Environments: Surface Waters, Coastal and Estuarine
Topics: Hydrosphere/Cryosphere:Surface Water:Water Quality/Chemistry, Biosphere:Microbiology, Ecology:Habitats:Marine, Water Column, Biosphere:Ecology:Food WebsKeyword: hypoxia